I hadn’t heard of Smash prior to discovering this tune, but from what I can tell, it was a television series in 2012-2013 about a group working to put on a Broadway musical about the life of Marilyn Monroe. This song was performed in the pilot episode of the series and, in the context of the musical, takes place when Joe DiMaggio sees Marilyn’s picture in a magazine and asks her out. Marilyn goes to the ball field to check things out and sings this bit with the New York Yankees.